14: Amazon Kindle Fire, Nov. 15, 2011: 50,000 per day (pre-sales)

Steve Kovach, Business Insider

Early leaked screenshots of Amazon's internal sales database suggest that Amazon was taking 50,000 preorders per day when it went on sale back in September. At that rate, Amazon will already have sold more than 2.5 million by the time it becomes available on Nov. 15.

13. Samsung Galaxy S II, May 2011: 55,000 per day.

Ellis Hamburger, Business Insider

Samsung reported sales of more than 3 million in its first 55 days on the market, which averages out to about 55,000 per day.

8. Sony PSP, Dec. 12, 2004: 100,000 per day.

According to NPD, Microsoft sold more than 300,000 boxed copies of Windows XP in its first three days of launch. But that doesn't include all the new PCs that shipped with XP preinstalled, so actual sales were probably quite a bit higher.

6. Windows 7, Oct. 22, 2009: more than 130,000 retail copies per day.

Microsoft

Microsoft never officially reported early sales figures for Windows 7. However, NPD found that it sold 234% faster than Vista, which itself sold 60% SLOWER than Windows XP. Back in 2001, NPD reported that Windows XP sold 300,000 units in its first three days. So doing all the math, we come up with a sales figure of about 130,000 retail copies per day.

That does not count all the PCs that were probably sold around the same time.

5. Nintendo 3DS, Feb. 26, 2011: more than 185,000 per day.

Steve Kovach

The 3DS launched strong in Japan, selling more than 370,000 units in its first two days. But interest died quickly, and Nintendo was forced to cut prices to spur sales.

4. Original iPad, Apr. 3, 2010: 300,000 in one day.

Apple boasted about these one-day sales statistics. At an average price of $600, that's $180 million in a day.

If you count video games as tech products, a lot of them have sold faster than the iPhone 4S.

For Call of Duty, Activision reported $360 million in one day sales -- that's sell-through to consumers, not just sell-in to stores. That amounted to about 5.6 million units.

The previous Call Of Duty sold about 4.7 million copies in 24 hours when it launched in 2009, and Halo 2 sold almost 2.4 million copies on launch in 2004 -- particularly impressive because it was only available on the Xbox.